WorldDiff

Compare two GeoJSON FeatureCollections by stable feature ID and produce both a machine-readable change summary and a map-ready GeoJSON change layer.

Run

python3 worlddiff.py old.geojson new.geojson --key parcel_id --out report

The key may be the GeoJSON top-level id (the default) or a property name. Output:

• report/summary.json — added, removed, and changed IDs plus changed property names;
• report/changes.geojson — added and changed features from the new file and removed features from the old file, each tagged with _worlddiff_change.

To render the change layer as an SVG map:

python3 worlddiff.py old.geojson new.geojson --out report --svg report/changes.svg

The SVG uses equirectangular projection with green for added features, red for removed, orange for changed.

WorldDiff compares coordinates and properties exactly. Coordinate-tolerance and topology-aware comparison belong in a later version only when exact GeoJSON comparison proves insufficient.

Check

python3 test_worlddiff.py